"Don't... Move.."

He says in a husky voice as he lowered his mouth on your shoulder, you were hissing in pain as he dug his fangs deep into your flesh, while also pulling you closer, sucking your blood out to satisfy his hunger

You didn't really knew this would happen.. more likely you were just called in here by your boss, then all of the sudden you are here, sitting on his desk whining quietly in pain as you let him suck your blood to his content.